JP7450898B2 - Wastewater treatment equipment and wastewater treatment method - Google Patents

Description

The present invention relates to a wastewater treatment device and a wastewater treatment method for treating wastewater including organic wastewater discharged from cooperative business complexes, food, chemical, paper, automobile factories, etc.

Conventional wastewater treatment equipment supplies ozone into the treatment tank that houses the wastewater to be treated, and its strong oxidizing action sterilizes bacteria contained in the wastewater, deodorizes it, and removes organic matter and fats and oils. There is a method that achieves effects such as decomposition and removal (for example, see Patent Document 1).

This kind of ozone is turned into bubbles with a microscopic diameter using a bubble generator, etc., effectively mixing with wastewater and promoting the decomposition of organic matter in the wastewater. known to disappear.

Japanese Patent Application Publication No. 2009-131827 (Page 6, Figure 1)

However, in Patent Document 1, ozone treatment is performed to sterilize organic matter contained in wastewater by supplying ozone to a treatment tank, but although this ozone treatment can obtain a certain sterilization effect, However, there is a problem in that the denitrification effect of reducing nitrogen components that cause eutrophication contained in the water to be treated is poor, and it is difficult to achieve sufficient purification of the water to be treated.

The present invention has been made with attention to such problems, and in addition to the decomposition treatment of organic matter in the water to be treated by ozone or the sterilizing effect of sterilizing it, it is possible to obtain a sufficient denitrification effect of the water to be treated. The purpose of the present invention is to provide a wastewater treatment device and a wastewater treatment method that can perform the following steps.

In order to solve the above problems, the wastewater treatment device of the present invention has the following features:
It is characterized by comprising at least a storage tank that stores water to be treated, and a supply means that supplies micro-nano bubbles containing at least ozone, oxygen, and α particles into the storage tank.
According to this feature, the organic matter dissolved or floating in the water to be treated is decomposed or sterilized by ozone micro-nano bubbles in the storage tank, and the remaining ozone bubbles floating in the water to be treated are chemically converted into oxygen molecules. By changing the amount of oxygen and generating abundant hydroxyl radicals, residual ozone can be reduced, and at the same time, it is possible to promote the decomposition of organic matter together with the oxygen contained in micro-nano bubbles. Furthermore, by floating micro-nano bubbles containing α particles in the water to be treated, the α particles can act over a wide range without being attenuated, and the denitrification effect can be enhanced.

The supply means is characterized in that it includes an introduction pipe with an opening for introducing air, an ozone generator communicating with the introduction pipe, and an α-ray source supplying α particles to the air.
According to this feature, an air-fuel mixture can be easily generated by providing α particles from the α-ray source to the oxygen-containing air introduced into the introduction tube and mixing ozone with the air.

The α-ray source section is characterized in that it is provided inside the introduction tube.
According to this feature, α particles can be stably supplied simply by circulating air within the introduction tube.

The α-ray source section is characterized by comprising a net-like member in which a large number of meshes are formed, and an α-particle releasing agent that coats the outer surface of the net-like member.
According to this feature, the α particles are reliably added to the air in the introduction pipe by passing through the mesh of the mesh member.

The supply means is characterized in that it has a nozzle that generates the micro-nano bubbles using cavitation.
According to this feature, micro-nano bubbles can be easily generated by the nozzle.

The housing layer is characterized in that a porous material containing at least aerobic microorganisms, containing carbon as a component, and having micro-nano level porosity is housed.
According to this feature, biological treatment can be activated by oxygen molecules and oxygen bubbles adsorbed to the porous material. Therefore, using only a single storage tank, biological treatment using aerobic microorganisms can be performed in addition to sterilization treatment using ozone and denitrification treatment using α particles.

The pores of the porous material are characterized in that they are formed to have a smaller diameter than the micro-nano bubbles.
According to this feature, ozone bubbles do not penetrate into the pores of the porous material, but instead adhere to the outer surface around the pores of the porous material, causing ozone molecules to chemically change into oxygen molecules. Therefore, the aerobic microorganisms within the pores come into contact with oxygen molecules without coming into contact with ozone molecules, that is, they obtain abundant oxygen and function actively without dying.

The porous material is characterized in that it is made of activated carbon.
According to this feature, the activated carbon can actively decompose residual ozone into oxygen that is effective for biological treatment. Further, due to the far-infrared effect of activated carbon, activation of microorganisms can be maintained even under adverse conditions such as water temperature of 10° C. or lower.

The porous material is characterized in that it is supported on a carrier.
According to this feature, the carrier can be used as a reaction site for ozonolysis and biological treatment.

The carrier is characterized in that facultative anaerobic microorganisms are supported on the carrier.
According to this feature, micro-nano bubbles consisting of microscopic air bubbles reduce water resistance and increase permeability, making it easier for water to penetrate into the inside of the carrier, stimulating facultative anaerobic microorganisms existing inside. Activate. As a result, both aerobic microorganisms and facultative anaerobic microorganisms are activated, and the food chain (including cannibalism between microorganisms) is promoted. Therefore, early and advanced biological treatment is possible without generating excess sludge. can be achieved.

The carrier is characterized in that it is configured to be able to support an enzyme.
According to this feature, by carrying an enzyme that activates the activity of aerobic microorganisms, the reproduction of aerobic microorganisms is promoted by the action of the enzyme.

The storage tank is characterized by comprising an introduction part for introducing the water to be treated at the upper part of the storage tank, and a discharge part for discharging the water treated in the storage tank at the lower part of the storage tank.
According to this feature, the water to be treated in the storage tank can be reliably ozonated and biologically treated during the flow process from the introduction part located in the upper part of the storage tank to the discharge part located in the lower part.

A bubble discharge port for discharging the micro-nano bubbles along the circumferential direction of the storage tank is formed in the lower part of the storage tank.
According to this feature, ozone and oxygen micro-nano bubbles discharged from the lower part of the storage tank rotate and rise along the inner peripheral wall along with the water to be treated and the porous material in the storage tank due to their buoyancy. Because it can generate a flow, the fluidity in the storage tank increases, and at the same time, the decomposition of suspended solids (SS) is promoted by the hydroxyl radical effect caused by the crushing action of micro-nano bubbles, so we provide a device that generates almost no surplus sludge. can do.

It is characterized in that a water intake port for absorbing the water to be treated in the storage tank is formed above the bubble outlet of the storage tank.
According to this feature, by making it easier to suck in micro-nano bubbles through the water inlet, the efficiency of crushing micro-nano bubbles can be increased.

The introduction part is characterized in that it is provided near the inner circumferential wall of the storage tank.
According to this feature, it is possible to efficiently mix the water to be treated introduced near the inner circumferential wall of the storage tank with the ozone and oxygen (air) micro-nano bubbles generated by the rotating upward flow along the inner circumferential wall. can.

The supply means for supplying the micro-nano bubbles is characterized in that it utilizes cavitation.
This feature can contribute to the decomposition of suspended solids (SS) in the water to be treated.

The wastewater treatment method of the present invention includes:
The method is characterized by having at least a bubble supply step of supplying micro-nano bubbles containing ozone, oxygen, and α particles to a storage tank that accommodates water to be treated.
According to this feature, the organic matter dissolved or floating in the water to be treated is decomposed or sterilized by ozone micro-nano bubbles in the storage tank, and the remaining ozone bubbles floating in the water to be treated are chemically converted into oxygen molecules. By changing the amount of oxygen and generating abundant hydroxyl radicals, residual ozone can be reduced, and at the same time, it is possible to promote the decomposition of organic matter together with the oxygen contained in micro-nano bubbles. Furthermore, by floating micro-nano bubbles containing α particles in the water to be treated, the α particles can act over a wide range without being attenuated, and the denitrification effect can be enhanced.

In the bubble supply step, micro-nano bubbles are generated in a mixture of the ozone and the air to which the α particles have been added.
According to this feature, a mixture can be easily generated by adding α particles to oxygen-containing air and mixing ozone.

The method is characterized by comprising the bubble supply step, and a biological treatment step in which biological treatment is performed using a porous material that includes at least aerobic microorganisms, contains carbon as a component, and has micro-nano level porosity.
According to this feature, biological treatment can be activated by oxygen molecules and oxygen bubbles adsorbed to the porous material. Therefore, in addition to sterilization treatment using ozone and denitrification treatment using α particles, biological treatment using aerobic microorganisms can be performed.

The pores of the porous material are characterized in that they are formed to have a smaller diameter than the micro-nano bubbles.
According to this feature, ozone molecules chemically change into oxygen molecules by contacting the outer surface around the pores of the porous material without the ozone bubbles penetrating into the pores of the porous material. Therefore, the aerobic microorganisms within the pores come into contact with oxygen molecules without coming into contact with ozone molecules, that is, they obtain abundant oxygen and function actively without dying.

The porous material is characterized in that it is made of activated carbon.
According to this feature, the activated carbon can actively decompose residual ozone into oxygen that is effective for biological treatment. Further, due to the far-infrared effect of activated carbon, activation of microorganisms can be maintained even under adverse conditions such as water temperature of 10° C. or lower.

1 is a plan view showing a wastewater treatment apparatus in Example 1. FIG. It is a longitudinal cross-sectional view showing a processing tank. FIG. 2 is a longitudinal cross-sectional view showing a microbubble generation nozzle for ozone, α particles, and oxygen. (a) is a front view showing the net-like member, (b) is a diagram showing a situation in which the net-like member is wound, and (c) is a sectional view taken along the line AA in FIG. 3. (a) is an enlarged view of portion B in FIG. 3, and (b) is an enlarged view of portion C in FIG. 3. It is a figure explaining the structure of a fungal bed and a carrier. FIG. 2 is a plan view showing a wastewater treatment device in Example 2. It is a longitudinal cross-sectional view showing a raw water tank and a reaction tank. It is a table showing experimental results regarding the amount of airflow inside the introduction pipe. It is a table showing experimental results regarding the number of net-like members loaded into the introduction tube. (a) is a table showing the results of an experiment regarding water quality improvement of treated water using α particles, and (b) is a photograph showing the treated water after the same experiment.

Embodiments for carrying out the wastewater treatment apparatus and wastewater treatment method according to the present invention will be described below based on examples.

A wastewater treatment apparatus according to Example 1 will be described with reference to FIGS. 1 to 6. First, reference numeral 1 in FIG. 1 is a wastewater treatment apparatus to which the present invention is applied. This wastewater treatment device 1 is installed in a food factory in this embodiment, and is a device that purifies wastewater containing organic components such as oil and fat disposed of from the factory as treated water before discharging it into a river etc. This wastewater treatment apparatus 1 is unique in that it can directly discharge water into rivers, waterways, sea areas, etc. without providing a settling tank or membrane treatment means.

As shown in FIG. 1, the wastewater treatment device 1 is connected on its upstream side to a raw water tank 4 that collects wastewater discharged from the inside of the factory 2 to the outside. Note that the wastewater treatment device according to the present invention is not limited to the food factory of this embodiment, but also includes general wastewater such as domestic wastewater from apartment complexes such as condominiums, and organic wastewater from business complexes, chemical factories, etc. It is widely applicable to hospitals, hotels, restaurants, etc., and can also be used in sewage treatment plants.

Further, the wastewater treatment device 1 is connected to a drain pipe 39 on the downstream side thereof for discharging treated wastewater, and the purified wastewater is discharged into a river or the like (not shown) via the drain pipe 39.

The wastewater treatment apparatus 1 of the first embodiment includes a treatment tank 30 for performing micro-nano bubble treatment and biological treatment as a storage tank into which water to be treated is introduced, and ozone, oxygen (air), and α particles, which will be described later. It mainly includes a bubble generator 40 as a supply means for supplying micro-nano bubbles. Each configuration of the wastewater treatment device 1 will be described in detail below.

As shown in FIG. 1, the raw water tank 4 is an approximately rectangular water tank in plan view into which wastewater collected from the factory 2 is introduced via the wastewater groove 3. A raw water pump 5 for transferring and a float 6 as a water level sensor are installed (see FIG. 7). In this embodiment, the internal capacity of the raw water tank 4 is approximately 2 tons, but in practice, less than 1 ton of stored water is transferred to the next treatment tank 30 by float control.

Next, as shown in FIGS. 1 and 2, the processing tank 30 will be explained. The treatment tank 30 is a substantially cylindrical water tank into which water to be treated from the raw water tank 4 is introduced via a transfer pipe 7 connected to a transfer pump 5. and a bubble discharge port 30c that discharges micro-nano bubbles (hereinafter sometimes referred to as micro-nano bubbles or simply bubbles) containing α particles, a discharge port 30d that communicates with the drain pipe 39 via an on-off valve 38 in an openable and closable manner, and a water level. A float 36 as a sensor is installed. This discharge method may be an overflow via piping from the lower part to the upper part without providing the on-off valve 38.

In this embodiment, the internal capacity of the processing tank 30 is approximately 54 tons, and the height in the vertical direction is longer than the inner diameter in the planar direction. In this way, by flowing micro-nano bubbles containing ozone, oxygen (air) and α particles over a wide range in the treatment tank 30 having a larger internal capacity, sterilization treatment with ozone (hereinafter also referred to as ozone treatment) can be performed. ), denitrification treatment by α particles, biological treatment by aerobic microorganisms, and chemical changes that reduce residual ozone after ozone treatment can be promoted. Further, the bubble outlet 30c communicates with the processing tank 30 and is connected to a bubble generator 40 installed outside the processing tank 30.

Further, as shown in FIG. 2, a large number of bacterial beds 50, 50, ... are placed inside the treatment tank 30, and these bacterial beds 50, 50, ... are composed of aerobic microorganisms and facultative anaerobic microorganisms. It has come to be used as a bacterial bed for sexual microorganisms. The bacterial beds 50, 50, . . . form substantially rectangular parallelepiped carriers 51, 51, . By forming the carriers 51, 51, ... into a substantially rectangular parallelepiped shape in this way, it is possible not only to improve the fluidity of the carriers 51, 51, ... floating in the water to be treated, but also to improve the fluidity of the carriers 51, 51, ... as they flow. The occurrence of chipping of 51, . . . can be suppressed. The fungal bed 50 is made of a synthetic resin made from a mineral material having a plurality of pores. In addition, not only aerobic microorganisms and facultative anaerobic microorganisms but also activated carbon 58 produced in powder form as described later is added to the fungal beds 50, 50, ... (see FIG. 6). Not only this, but a neutralizing agent, an odor suppressant, etc. can also be added.

The processing tank 30 is provided with an inlet 17a opened at the tip of the transfer pipe 17 described above at the top of the processing tank 30, and a discharge port 30d communicating with a drain pipe 39 via an on-off valve 38 at the bottom of the processing tank 30. Since it is provided near the bottom of the transfer pipe 17, the water to be treated introduced into the treatment tank 30 from the inlet 17a of the transfer pipe 17 descends while being subjected to biological treatment. According to this, the water to be treated introduced from the upper part of the treatment tank 30 flows to the lower part of the treatment tank 30, so that the biological treatment in the treatment tank 30 can take a longer time. The drain pipe 39 is once raised to the water surface level of the treatment tank 30, and the same amount of water as that flowing in from the inlet 17a is discharged as it is by gravity.

Furthermore, since the bubble outlet 30c is open in the circumferential direction of the inner circumferential wall 30a of the processing tank 30, when micro-nano bubbles are discharged from the bubble outlet 30c, a circulating flow is generated within the cylindrical processing tank 30. The micro-nano bubbles adhere to the bacterial beds 50, 50, ... and are moved upward by the circulation flow while increasing their buoyancy, and as the micro-nano bubbles are crushed or detached over time, they are dropped downward again, resulting in biological treatment. can be done effectively.

Note that a stirring plate or the like for stirring the bacterial beds 50, 50, etc. may be provided on the inner peripheral surface of the processing tank 30, and by doing so, the inside of the processing tank 30 is rotationally driven. Then, the bacterial beds 50, 50, . . . are moved upward by the above-mentioned stirring plate and thrown downward again, so that biological treatment can be performed effectively.

Next, as shown in FIGS. 1 to 3, the bubble generator 40 will be explained.

The bubble generator 40 includes a water suction pump 47 that is connected to a connecting pipe 48 that communicates with a water suction port 30b opened near the bottom of the lower part of the processing tank 30, and that absorbs liquid, a micro-nano bubble generation nozzle 45 (nozzle), and a water suction pump 47 that absorbs liquid. It mainly consists of an ozone generator 49 connected to a micro-nano bubble generating nozzle 45. This water suction pump 47 is configured to suck the liquid inside the processing tank 30 through the water intake port 30b of the processing tank 30.

The micro-nano bubble generation nozzle 45 is attached to the downstream side of the connecting pipe 48 extending from the water suction pump 47, and the liquid absorbed by the water suction pump 47 is supplied to the micro-nano bubble generation nozzle 45 and blown out. ing.

The micro-nano bubble generating nozzle 45 is of a shearing type that self-suctions ozone and air, and is characterized in that it utilizes cavitation. Note that when the bubble generator 40 is installed outside and a circulation line is provided as in this embodiment, a pressurized melting method can also be applied. The micro-nano bubble generating nozzle 45 may be of any type, but it is necessary that it does not become clogged even if solid matter flows into it. As an example, as shown in FIG. 3, the micro-nano bubble generation nozzle 45 includes a supply section 21 connected to a connection pipe 48 of a water suction pump 47 and supplied with liquid, and a supply section 21 that compresses the liquid supplied from the supply section 21. The nozzle member has a substantially cylindrical shape (straight pipe shape) and includes a compression section 22 (passage section) through which the liquid passes through, and a blowout section 23 from which the liquid that has passed through the compression section 22 is blown out.

The inner diameter of the supply section 21, which is a liquid inlet, is substantially parallel to the compression section 22, and the inner diameter of the blowout section 23 is expanded from the compression section 22. That is, the inner diameter of the compression part 22 is the minimum, and the flow rate of the liquid supplied from the supply part 21 increases when it passes through the compression part 22, and the flow rate of the waste water becomes high due to the Venturi effect, and the liquid is sent to the blowout part. It is blown out from 23.

The ozone generator 49 installed outside the processing tank 30 generates the air supply pipe 41 and the air supply pipe 46 formed in a substantially T-shape, which are connected to the ozone generator 49. The branch part 46b and the main pipe part 46a The ozone sucked in through the micro-nano bubble generating nozzle 45 is ejected into the compression section 22 through a plurality of branch pipes 24. In addition, the air containing oxygen taken into the micro-nano bubble generation nozzle 45 from the atmosphere through the cylindrical introduction pipe 61 and the main pipe part 46a of the air supply pipe 46 merges with the ozone mentioned above, and is connected to a plurality of branch pipes. 24 and into the compression section 22. Note that an on-off valve 62 is interposed between the introduction pipe 61 and the main pipe portion 46a of the air supply pipe 46, and in this embodiment, the internal valve body 62b can be adjusted to an arbitrary opening degree by a manual operation part 62a. It is regulated so that the air flow rate can be controlled. In this way, the ozone bubbles and oxygen (air) bubbles ejected from the branch pipe 24 into the compression section 22 become ultrafine bubbles and are mixed with the liquid within the compression section 22 . At this time, cavitation also occurs and contributes to the decomposition of suspended solids (SS). Then, these ultrafine bubbles are ejected from the blow-off section 23 into the processing tank 30 through the bubble discharge port 30c as micro-nano bubbles of ozone and oxygen (air), that is, bubbles with a nano-level diameter.

That is, the micro-nano bubble generation nozzle 45 is disposed in a connecting pipe 48 that communicates with the inside of the processing tank 30, and is configured to blow out a liquid containing micro-nano bubbles into water through the bubble discharge port 30c.

As shown in FIG. 3, the introduction pipe 61 connected to the upstream side of the air supply pipe 46 is formed into a cylindrical shape with both ends communicating. The nominal diameter d of the introduction tube 61 is approximately 3 cm in this embodiment, but is not limited to this, and is preferably designed within the range of approximately 1 cm to 5 cm. Further, the extension L of the introduction tube 61 is approximately 15 cm in this embodiment, but is not limited to this, and is preferably designed within a range of approximately 10 cm to 20 cm.

Inside the introduction tube 61, a predetermined number (two in this embodiment) of wound mesh members 65 (in this embodiment, two) are wound as α-ray sources. As shown in FIG. 4A, substantially the entire surface of the net-like member 65 is coated with a coating agent 66 containing a radioactive substance that emits α-rays to the outside. This mesh member 65 is made of a wire mesh having relatively soft elasticity, and has a mesh 65a having a large number of fine holes (1 cm or less), and in its natural state, it has a horizontally elongated substantially rectangular flat surface shape. be. As shown in FIG. 4(b), the net-like member 65 is wound around the core material 64 provided on one of its short sides, and is wound inside the introduction tube 61 as shown in FIG. This is what was inserted. Note that the net-like member 65 does not particularly need to be provided with the core material 64.

In this way, the bubble generator 40 includes an introduction pipe 61 having an opening for introducing air, an ozone generation part communicating with the introduction pipe 61, and a mesh member 65 coated with a coating agent 66 as an α-ray source part. By having these, it is possible to easily generate an air-fuel mixture by providing α particles to the oxygen-containing air introduced into the introduction pipe 61 and mixing ozone with it.

Furthermore, since the net-like member 65 is provided inside the introduction tube 61, α particles can be stably supplied simply by circulating air within the introduction tube 61.

As shown in FIG. 4(c), the net-like member 65 is exposed to the inner circumferential surface of the introduction tube 61 due to the force exerted in the outer radial direction in an attempt to elastically restore the original flat surface shape inside the introduction tube 61. They are in close contact over substantially the entire circumference of 61a. In other words, the mesh member 65 is formed in a substantially spiral shape around the core material 64 when viewed in the tube axis direction of the introduction pipe 61, and the air (outside air) flowing into the introduction pipe 61 comes into contact with the surface of the mesh member 65. , and flows out to the downstream side in the tube axis direction while passing through a large number of meshes 65a many times.

As described above, since the coating agent 66 as an α-ray source is applied to almost the entire surface of the net-like member 65, α-rays are emitted outward from the entire surface of the net-like member 65 in all directions. . Therefore, when the air (outside air) flowing into the introduction pipe 61 contacts or approaches the surface of the net-like member 65 or passes through the mesh 65a, it absorbs α rays (α) emitted from the entire surface of the net-like member 65. It receives the particles 66a) sufficiently and flows out from the introduction pipe 61 together with the α particles 66a.

As described above, the α-ray source section of the present invention is composed of the net-like member 65 in which a large number of meshes 65a are formed, and the coating agent 66 as an α-particle releasing agent that coats the outer surface of the net-like member 65. When the air passes through the mesh 65a of the mesh member 65, the α particles 66a are reliably added to the air.

Here, in this embodiment, the α rays are linearly emitted in the normal direction starting from substantially the entire surface of the portion constituting each mesh 65a of the net member 65, that is, inside the introduction tube 61, the α rays are α rays are emitted in the axial direction, the tube diameter direction, and all linear directions inclined thereto.

In addition, the penetrating power of alpha rays is so weak that it can be blocked by a single sheet of paper, and the range of alpha rays in the air is generally several cm (approximately 3 cm to 8 cm). Since the α rays emitted to the air passing through the cylindrical introduction tube 61 (hereinafter referred to as passing air) with an inner diameter d of approximately 3 cm are within its range, they are not attenuated. Can reach the air passing through.

Furthermore, since the α particles 66a do not move in the air themselves, but follow the passing air that moves inside the pipe, the range of the α particles 66a itself is cm, it is possible for the passing air to travel a distance of several meters to the bubble discharge port 30c, and further to be included in the micro-nano bubbles and move in the water to be treated.

The coating agent 66 of this embodiment is a liquid solution prepared by diluting thorium dioxide (ThO ₂ ) with an inert solvent as a compound of thorium (Th232), which is a radioactive element that emits weak α-rays, and is applied to the net-like member 65 . However, it is applied in an amount of 5% or less by weight without any other legal restrictions. Here, thorium (Th232) is a metal that exists in nature and is known as a radioactive element that has an extremely long half-life of 14 billion years, that is, it semipermanently emits α rays. Note that the material is not limited to this, as long as it is a material that can emit alpha rays and is used in a legal amount.

In this way, the air (outside air) that has passed through the introduction pipe 61 passes through the air supply pipe 46 on the downstream side while being accompanied by α particles 66a, and after being mixed with ozone supplied through the air supply pipe 41, as will be described later. The bubbles are then blown out into the water being treated as micro-nano bubbles.

In addition, the range of alpha rays in water is generally about 1/1000th of the range in air, which is very short at several tens of micrometers, but ozone and air (outside air) that make up micro-nano bubbles Since the α particles 66a contained in the mixture with the mixture can freely move through the water to be treated without attenuation over long distances, they are dispersed in the wastewater that is the water to be treated. The α particles 66a can efficiently reach the particles contained in the water to be treated, and as a result, the α particles 66a can efficiently act on the nitrogen components contained in the water to be treated and promote the denitrification effect, contributing to the purification effect of wastewater. .

Regarding the denitrification effect of α particles, as shown by the experiment described below, a significant decrease in total nitrogen (TN) in the water to be treated was confirmed. The effect of α particles is that by adding α particles to nitrogen compounds containing nitrogen atoms contained in the water to be treated, in addition to the effect of emitting protons from the nitrogen nucleus confirmed by the so-called Rutherford experiment, it also causes eutrophication. Possible effects include chemically changing some of the nitrogen compounds that cause this and releasing them into the outside air as nitrogen molecules.

In this embodiment, a bubble generator 40 that mixes ozone, oxygen (air), and α particles to generate micro-nano bubbles is provided; Additionally, a bubble generator that generates micro-nano bubbles of ozone and a bubble generator that generates micro-nano bubbles of oxygen (air) and α particles may be provided separately. Further, it may be used in combination with a conventional air diffuser (air diffuser, diffuser, etc.).

Next, a procedure for treating wastewater by the treatment apparatus 1 of the above embodiment will be explained using FIGS. 1 to 3. First, when more than a certain amount of wastewater (water to be treated) discharged from the factory 2 is stored in the raw water tank 4, the float 6 detects a predetermined water level, and the raw water pump 5 is activated to pump the raw water into the raw water tank. The water to be treated in the tank 4 is transferred to the treatment tank 30. That is, the water to be treated in the raw water tank 4 is intermittently transferred to the treatment tank 30.

In the treatment tank 30, in the bubble supply step, ozone treatment using micro-nano bubble ozone and denitrification treatment using α particles contained in the bubbles are performed. To be more specific, ozone (O ₃ ), which has a strong oxidizing power, is bubbled into micro-nano-level bubbles, which generates a large amount of OH groups (OH ⁻ ) and removes organic matter contained in the water to be treated. Physically decompose. In this way, since organic matter is physically decomposed by ozone (O ₃ ), it becomes easier to be eaten by microorganisms, which will be described later.

Note that most of the ozone (O ₃ ) in the treatment tank 30 is chemically changed into oxygen (O ₂ ) due to the oxidation effect described above, but the rest still remains as ozone micro-nano bubbles. (hereinafter referred to as residual ozone).

In addition to the ozone treatment mentioned above, α particles contained in micro-nano bubbles moving in the water to be treated act on the nitrogen nuclei of nitrogen compounds in the water to be treated, resulting in a high denitrification effect of the water to be treated. It has become.

As shown in FIG. 2, the water to be treated in the treatment tank 30 is stirred and mixed with the bacterial beds 50, 50, carrying aerobic microorganisms in the biological treatment process, that is, the treatment tank 30. Biologically treated. More specifically, the liquid containing ozone/oxygen (air) micro-nano bubbles generated by the ozone/oxygen (air) bubble generator 40 is passed through the bubble outlet 30c provided near the bottom of the lower part of the processing tank 30. The liquid is discharged into the processing tank 30 more easily.

The bubble outlet 30c opens in a direction along the circumferential direction of the inner circumferential wall 30a of the substantially cylindrical processing tank 30, and together with the water to be treated sucked by the water suction pump 47 from the water inlet 30b, the bubble outlet 30c Ozone/oxygen (air) micro-nano bubbles discharged from the tank can generate a rotating upward flow that rotates and rises along the inner circumferential wall 30a, accompanied by the water to be treated and the carrier 51 in the treatment tank 30 due to their buoyancy. The fluidity in the treatment tank 30 increases, and at the same time, the decomposition of suspended solids (SS) is promoted by the hydroxyl radical effect caused by the crushing action of micro-nano bubbles, so it is possible to provide an apparatus in which almost no excess sludge is generated. Note that after reaching the vicinity of the water surface, the rotating upward flow generates a downward flow that descends approximately at the center of the processing tank 30, and the downward flow that reaches the vicinity of the bottom of the processing tank 30 turns into a rotating upward flow again. By merging, a circulating flow that circulates within the processing tank 30 is generated. Moreover, the water intake port 30b is opened at a higher position than the bubble discharge port 30c, so that the micro-nano bubbles discharged from the bubble discharge port 30c can be easily sucked in, and the efficiency of crushing the micro-nano bubbles can be increased.

Further, when the micro-nano bubbles are crushed in this manner, the α particles contained in the bubbles act on nitrogen compounds containing nitrogen atoms in the water to be treated, thereby obtaining a denitrification effect.

Here, an inlet 17a of the transfer pipe 17 for transferring the water to be treated from the raw water tank 4 to the treatment tank 30 is provided at the upper part of the treatment tank 30, and an outlet 30d for discharging the biologically treated water to be treated is provided. Since it is provided at the lower part of the treatment tank 30, the water to be treated in the treatment tank 30 is flowed from the inlet 17a located at the upper part of the treatment tank 30 to the outlet 30d located at the lower part. Ozone treatment, denitrification treatment, and biological treatment can be performed reliably.

In addition, since the inlet 17a opens near the inner peripheral wall 30a at the upper part of the treatment tank 30, the water to be treated that has just been discharged from the inlet 17a and transferred to the treatment tank 30 immediately flows along the downward flow described above. Avoiding the possibility that the ozone and oxygen will fall, the rotating upward flow can be efficiently mixed by facing the generated micro-nano bubbles of ozone and oxygen near the inner peripheral wall 30a.

Next, each of the bubbles generated by the bubble generator 40 contains α particles as well as ozone and oxygen (air). As mentioned above, the range of the α particles themselves is short, several tens of cm, but since the bubbles themselves travel long distances underwater, the α particles do not travel through the air (inside the bubbles). That is, the bubble can be moved over a long distance underwater without being attenuated. Furthermore, after traveling a long distance, the α particles come into contact with the water to be treated as the bubbles collapse. Therefore, the α particles can efficiently come into contact with nitrogen components contained in the water to be treated, and as a result, a high denitrification effect can be achieved.

Next, since the bubbles with a diameter of 50 μm or less generated by the bubble generator 40 have a bubble diameter that allows them to stay in water for the longest time, the liquid staying in the treatment tank 30 contains microbubbles and at the same time , a large amount of oxygen is dissolved, and sufficient oxygen is continuously supplied to the water to be treated and the bacterial beds 50, 50, . . . in the treatment tank 30.

Specifically, since the bubble generator 40 is capable of generating bubbles with a diameter of 50 μm or less, it can dissolve more oxygen in the liquid than normal bubbling, and can dissolve the water and bacteria in the treatment tank 30. Sufficient oxygen will continue to be supplied to the beds 50, 50, . Since the liquid permeates into the water to be treated and the bacterial beds 50, 50, ... with bubbles retained, it is difficult to reach the water to be treated and the bacterial beds 50, 50, ... by simply bringing it into contact with air through stirring by circulating flow. Air can be effectively supplied to the aerobic microorganisms present inside the mass, and the aerobic microorganisms can be activated to exhibit high aerobic decomposition ability.

In addition, since the outside air (air) is mixed into the liquid as ultrafine bubbles by the bubble generator 40, this air can be retained in the wastewater for a long time, and the air is mixed by the bubble generator 40. It is possible to make the inside of the drain pipe 39 leading to a river, waterway, sea area, sewage treatment facility, etc. aerobic by making the air (dissolved oxygen) stay in the waste water, and the effect of reducing the frequency of cleaning inside the drain pipe 39. can be expected.

In this way, in the treatment tank 30, the water to be treated and residual ozone that has been sterilized by ozone in the bubble supply process is treated in the biological treatment process in the treatment tank 30 containing the carrier 51 carrying aerobic microorganisms. By supplying micro-nano bubbles of oxygen, aerobic microorganisms activated by this oxygen effectively perform biological treatment of the water to be treated, and the oxygen added to the residual ozone actively chemically converts hydroxyl radicals and oxygen. By changing the amount, this residual ozone can be reduced at an early stage. Furthermore, suspended solids (SS) are decomposed due to the cavitation effect caused by the hydroxyl radicals generated in large quantities and the micro-nano bubble generation nozzle 45, so that the generation of excess sludge is extremely reduced. In addition, since the micro-nano bubbles containing α particles float in the water to be treated, the α particles themselves do not move, so the α particles act over a wide range without being attenuated, and the denitrification effect can be enhanced.

Here, with reference to FIG. 9, experimental results regarding the amount of air passing through the inside of the introduction tube 61 loaded with the mesh member 65 will be shown below. In this experiment, a predetermined number of mesh members 65 were loaded inside the introduction pipe 61, and the flow rate of air passing through the introduction pipe 61 (2.5 L/min to 10 L/min) was used as a parameter. This is a comparison of the purification effects of treated water.

Using an aqueous solution of skim milk powder with a certain concentration as the water to be treated, artificial waste water (raw water) was used, and the net-like member was used at various aeration rates (2.5 L/min, 5 L/min, 7.5 L/min, and 10 L/min). Microbubbles of a mixture of air aerated through the introduction pipe 61 loaded with 65 and ozone at a constant flow rate (5 L/min) were blown into the water to be treated, and the water quality of each water to be treated was analyzed and compared. . The analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, total nitrogen TN, and total phosphorus TP.

As shown in Figure 9, when the aeration rate is 2.5 L/min, the biochemical oxygen A significant reduction in demand BOD and total nitrogen TN was confirmed. In particular, the total nitrogen TN decreased by 20% to 42 (mg/L) compared to 50 (mg/L) in the raw water. No significant differences due to differences in ventilation amount were confirmed for other analysis items.

Therefore, when the aeration rate in the introduction pipe 61 was 2.5 L/min, the biochemical oxygen demand BOD and total nitrogen TN decreased the most, that is, the best effect of improving water quality was obtained. This is considered to be because by keeping the passage speed of the air in the introduction tube 61 low, the air comes into contact with more α particles.

Next, with reference to FIG. 10, experimental results regarding the number of mesh members 65 (referred to as catalysts in the figure) to be loaded into the introduction pipe 61 will be shown below. In this experiment, the number of mesh members 65 loaded in the introduction tube 61 (1 This figure compares the purification effect of the water to be treated at each loading number, using 4 to 4) as parameters. Regarding the manner in which the net-like member 65 is loaded into the introduction tube 61, in detail, when one net-like member 65 is loaded, it is placed approximately in the center of the introduction tube 61, and when two net-like members 65 are loaded, the net-like member 65 is placed approximately in the center of the introduction tube 61. In the case where three mesh members 65 are placed at both ends in the tube axis direction within the introduction pipe 61, when they are arranged equidistantly with a certain interval of separation in the introduction pipe 61, and when four mesh members 65 are loaded. were placed in the introduction tube 61 without any gaps.

Using an aqueous solution of skim milk powder at a certain concentration as the water to be treated, artificial sewage (raw water) is used, and air is aerated through the introduction pipe 61 loaded with each loading number (1 to 4) of mesh members 65; Microbubbles of a mixture with ozone at a constant flow rate (5 L/min) were blown out into the water to be treated, and the water quality of each water to be treated was analyzed and compared. The analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, total nitrogen TN, and total phosphorus TP.

As shown in FIG. 10, when two mesh members 65 are loaded into the introduction tube 61, the total nitrogen T−N A significant decrease was confirmed. Regarding other analysis items, a decrease in the biochemical oxygen demand BOD was confirmed for each number of loaded mesh members 65 (1 to 4), but there was no significant difference due to the difference in the number of loaded mesh members 65. was not confirmed.

Therefore, when two mesh members 65 were loaded into the introduction pipe 61, the total nitrogen TN decreased the most, that is, the best effect of improving water quality was obtained. This is considered to be because the plurality of mesh members 65 were arranged within the introduction tube 61 at a certain distance or more apart from each other, so that the α particles could be supplied without impeding the air permeability within the introduction tube.

Next, with reference to FIG. 11, experimental results regarding water quality improvement of treated water using α particles will be shown below. This experiment was carried out using 2.5 L/min, which was evaluated as the optimal ventilation volume in the experiment regarding the ventilation volume in the introduction pipe 61 mentioned above, and the optimal loading in the experiment regarding the number of loaded mesh members 65 in the introduction pipe 61. The effect of purifying the water to be treated was confirmed using the two evaluated as a fixed condition.

As the water to be treated, wastewater (raw water) obtained by diluting industrial wastewater 7 times was used, and the inside of the introduction pipe 61 loaded with two mesh members 65 (referred to as catalysts in the figure) was aerated at a flow rate of 2.5 L/min. Microbubbles of a mixture of air containing α particles and ozone at a constant flow rate (5 L/min) were blown into the water to be treated, and the water quality of each water to be treated was analyzed. For comparison, micro-nano bubbles made of only a mixture of ozone and air without α particles were blown into the same water to be treated, and the purification effect of the water irradiated with ultraviolet rays was confirmed. The analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, suspended solids amount SS, normal hexane extraction amount n-Hex, and total nitrogen TN.

As shown in Figure 11(a), when microbubbles of a mixture of air and ozone containing α particles are blown into the water to be treated, microbubbles of a mixture of air and ozone that do not contain α particles are blown out. Compared to the case where the water was blown out into the water to be treated and irradiated with ultraviolet rays, a remarkable decrease was confirmed in the biochemical oxygen demand BOD, chemical oxygen demand COD, and total nitrogen TN. In particular, the total nitrogen TN was 78 (mg/L) for untreated raw water (7 times diluted), and microbubbles of a mixture of air and ozone containing α particles were blown into the treated water. In this case, it was reduced by 40% to 47 (mg/L), and a special effect was obtained.

In addition, as shown in Figure 11(b), while the untreated raw water (on the left side of the figure) was brown, microbubbles of a mixture of air and ozone containing α particles were blown into the water to be treated. In this case, the water to be treated (on the right side of the figure) became colorless and transparent, and visual inspection clearly showed the best improvement in water quality. As a comparison, when microbubbles of a mixture of air and ozone containing no α particles were blown out into the water to be treated and irradiated with ultraviolet rays, the water to be treated (in the center of the figure) was pale yellow. Therefore, the result was obtained that micro-nano bubbles containing α particles are significantly superior in denitrification effect at least compared to micro-nano bubbles containing no α particles. In particular, α particles contained in micro-nano bubbles can travel long distances in the water to be treated by following the micro-nano bubbles without moving in the air, that is, they can travel long distances without attenuation. This provides many opportunities for contact with nitrogen compounds in the water to be treated, resulting in a high denitrification effect.

In addition, since the bubbles containing α particles are many micro-nano bubbles with a particle size below the micro level, these bubbles can come into contact with the contents of the water to be treated with a larger surface area, which increases the oxygen supply effect and A high degree of water purification can be achieved through the denitrification effect.

Hereinafter, the fungal bed 50 will be explained with reference to FIG. 6. Here, the fungal bed 50 is a carrier 51 inoculated with aerobic microorganisms and facultative anaerobic microorganisms, and the carrier 51 refers to a carrier 51 that is not inoculated with microorganisms. Furthermore, the synthetic resin made from minerals that constitutes the carrier 51 means a synthetic resin that is not decomposed by aerobic microorganisms, excluding natural resins such as plant resins.

Regarding the inoculation of the carrier 51, by operating the wastewater treatment device 1 according to the present invention, local soil bacteria derived from the natural world are naturally inoculated and the fungal bed 50 is generated.

The fungal bed 50 includes a carrier 51 made of a synthetic resin made from mineral materials and having a plurality of pores 52, and aerobic microorganisms and facultative anaerobic microorganisms in at least a part of the plurality of pores formed in the carrier 51. It is configured to contain activated carbon 58 produced in the form of powder with a minute diameter and capable of supporting aerobic microorganisms and a predetermined amount of enzymes that activate the activities of aerobic microorganisms. FIG. 6 is a diagram showing the structure of the fungal bed 50 and carrier 51. Holes 52 are formed in a carrier 51 made of synthetic resin made from mineral materials. The pores 52 include those at least partially communicating with other pores and those not communicating with other pores. The pores 52 have a size of about 50 μm to about 800 μm, and the pores 52 of various sizes are almost uniformly dispersed in the carrier 51. Further, the pores 52 can support enzymes 53 and contain powdered activated carbon 58, and the pores 52 serve as nests for aerobic microorganisms and facultative anaerobic microorganisms (not shown). The large pores 52 are not filled with spreadable enzymes, and as described below, sewage and air enter and exit the pores 52 due to the stirring action, creating an environment suitable for aerobic microorganisms to grow. . In addition, since the small pores 52 are filled with enzymes, there is little ingress and egress of waste water and air, but the enzymes seep out little by little and function as an enzyme supply source for a long period of time.

The pores 52 can support a spreadable enzyme that activates the activity of aerobic microorganisms, so that the action of the enzyme promotes the reproduction of aerobic microorganisms. The enzymes supported on the carrier are used to ensure that the growth of aerobic microorganisms is not affected even if the installation environment and operating conditions of the sewage treatment equipment change. Allowing them to reproduce. In this example, the above-mentioned enzyme is supported in the pores 52, but it is not necessarily necessary for the carrier 51 to support the enzyme.

In addition to the aerobic microorganisms described above, a certain amount of facultative anaerobic microorganisms are present inside the carrier 51, particularly in the pores 52 in the center. These facultative anaerobic microorganisms are hardly activated in normal aerated water because the water to be treated cannot penetrate into the inside of the carrier 51, but in the case of micro-nano bubbles made of microscopic air bubbles, water resistance is reduced. This increases permeability, making it easier for water to penetrate into the inside of the carrier 51, and after oxygen is adsorbed by aerobic microorganisms on the surface layer, facultative anaerobic microorganisms present inside are stimulated by the micro-nano bubble water and activated. do. As a result, both aerobic microorganisms and facultative anaerobic microorganisms are activated, and the food chain (including cannibalism between microorganisms) is promoted. Therefore, early and advanced biological treatment is possible without generating excess sludge. can be achieved. It also achieves a cycle of nitrification by aerobic microorganisms and denitrification by anaerobic microorganisms, and has the effect of a nitrification-denitrification device. As an example, when the wastewater treatment device according to the present invention was applied to the treatment of wastewater discharged from a fruit and vegetable processing factory, the required power was significantly reduced to about 1/10 of the conventional one, achieving revolutionary energy savings. We successfully solved the conventional problem of odor in a few days and dramatically purified the effluent water.

As described above, since the fungal bed 50 is made of synthetic resin made from mineral materials, it is not decomposed by microorganisms, and the carrier 51 and, by extension, the plurality of pores in which microorganisms are supported, are stably maintained. It will be possible to secure it. In addition, by the action of activated carbon and/or enzymes supported in the pores of the carrier, not only can the reproduction rate of aerobic microorganisms be increased, but also aerobic microorganisms and facultative anaerobic microorganisms can be sufficiently grown. It can also suppress bad odors. Further, since aerobic microorganisms and facultative anaerobic microorganisms are supported within the pores, they will not be washed out even by impact from circulating flow or water sprinkling.

Further, as described above, by supplying ozone micro-nano bubbles to the treatment tank 30, the ozone can effectively decompose floating organic matter contained in the water to be treated in the treatment tank 30. In particular, minute ozone bubbles with a nano-level diameter are supplied near the bottom of the treatment tank 30 to decompose surrounding organic matter, and then gradually decompose organic matter while floating in the water to be treated. By reaching this point and decomposing the organic matter floating in the vicinity, it is possible to decompose the organic matter contained in the total amount of water from the bottom of the water to the surface of the water while coming into contact with it.

Further, residual ozone bubbles contained in the water to be treated in the treatment tank 30 drift in the circulation flow in the treatment tank 30 together with the water to be treated and oxygen bubbles in the treatment tank 30 . Here, the carrier 51, which also drifts with the water to be treated, serves as a place to collect the remaining ozone bubbles and oxygen (air) bubbles.In other words, the remaining ozone bubbles are adsorbed by the pores 52 of the carrier 51, causing the ozone molecules to interact with each other. The chemical change that converts into oxygen molecules is promoted. In particular, as shown in the detailed enlarged view of FIG. 6, activated carbon 58 is contained in and around the pores 52 of the carrier 51, so that active carbon 58 is actively absorbed into the pores 58a (pores) of the activated carbon 58. can easily decompose ozone molecules O ₃ and chemically change them into oxygen molecules O ₂ .

More specifically, the pores 58a of the activated carbon 58 are formed into nano-level pores of approximately 2 nm to 50 nm, and many aerobic microorganisms reside inside the pores 58a as their habitat. On the other hand, since ozone bubbles are approximately 50 nm to 200 nm, that is, the pores 58a of the activated carbon 58 have a smaller diameter than the ozone bubbles, the ozone bubbles do not enter the inside of the pores 58a. By adhering to the outer surface 58b around the porous 58a, ozone molecules O ₃ are chemically changed into oxygen molecules O ₂ . Therefore, the aerobic microorganisms within the porous 58a come into contact with oxygen molecules O ₂ without coming into contact with ozone molecules O ₃ , that is, they obtain abundant oxygen and function actively without dying.

In this way, the carrier 51 in the treatment tank 30 serves as a place for collecting residual ozone and oxygen bubbles in its pores 52, thereby reducing and eliminating the residual ozone and at the same time changing the residual ozone into oxygen bubbles. The aerobic microorganisms supported by the carrier 51 can be activated by the abundant oxygen effective for biological treatment including the added oxygen molecules.

Hereinafter, the synthetic resin made from a mineral material that constitutes the carrier 51 will be explained. The carrier 51 is made of an elastic material having a high shape restoring force at least in its outer skin portion. By configuring at least the outer skin part of the carrier from an elastic material with high shape restoring force, at least the skin part of the fungal beds will not collide or come into contact with each other during the agitation process between the water to be treated and the fungal bed in the treatment tank. By repeating compression and restoration, the suction and removal of moisture and air from the pores of the bacterial bed is promoted, and the air and moisture necessary for the reproduction of aerobic microorganisms can be sufficiently supplied into the pores of the bacterial bed.

Moreover, in the sewage treatment machine, the fungal bed 50 is exposed to water, and at the same time, the temperature may reach close to 60° C. due to the activity of microorganisms. Furthermore, aerobic microorganisms usually become active in neutral to slightly acidic environments. However, depending on the conditions, the pH may drop during the process of decomposing organic matter, and the activity of aerobic microorganisms may be inhibited. In order to prevent such a situation, an appropriate amount of caustic soda, lime, calcium carbonate, etc. may be put into the treatment tank 30 to adjust the pH, and the pH inside the sewage treatment machine may change significantly.

Therefore, urethane sponge is used as the material constituting the carrier 51. Urethane sponges have excellent water absorption, drainage properties, and water resistance, and do not deteriorate even in acidic, alkaline, or high-temperature environments, so there is no need to periodically replenish the carrier.

Furthermore, the urethane sponge constituting the carrier has the characteristic that its density can be manufactured with some degree of freedom. Therefore, if the urethane sponge is manufactured so that its specific gravity is almost equal to that of the suspended solids (SS) when it contains waste water, the bacterial bed will not be separated from the suspended solids (SS) during stirring, and the This will accelerate the decomposition of suspended solids (SS). Note that the urethane sponge is just one example, and any material having the same characteristics as the urethane sponge can be used.
The stirring action within the processing tank 30 in FIG. 2 will be described below.

When the above-mentioned rotating upward flow of the water to be treated is generated in the treatment tank 30, the bacterial beds 50, 50, ... are moved upward by the rotating upward flow, and the bacterial beds 50, which had been submerged in the sewage until then, are , the bacterial beds undergo compression and restoration due to mutual collision and contact. By repeatedly receiving such stirring action, the absorption and removal of moisture and air from the pores of the bacterial bed is promoted, and the oxygen and moisture necessary for the reproduction of aerobic microorganisms and facultative anaerobic microorganisms are transferred into the pores of the bacterial bed. will be able to provide sufficient supply.

In this way, the aerobic microorganisms and facultative anaerobic microorganisms supported on the bacterial bed 50 are activated by the stirring action, the activated carbon supported in the pores, and the action of enzymes, and the water to be treated inside the treatment tank 30 is activated. The organic components contained in the water are decomposed and the wastewater is purified.

The shape of the carrier is not limited to the approximately rectangular parallelepiped shown in FIG. 6, but may also be approximately cubic, approximately spherical, approximately cylindrical, tubular, or approximately regular octahedral. Further, by using a mixture of carriers 51 having different shapes, it is possible to maintain a large gap between the carriers, and it is also possible to further improve water permeability and air permeability within the sewage treatment tank. The length of one side of the carrier 51 is configured to be about 5 mm to about 10 cm, but the length of each side of the carrier 51 is set in consideration of the capacity of each tank of the wastewater treatment device 1 and the quality of the wastewater to be treated (BOD, COD, SS, n-Hex). can determine its size.

In addition, in Fig. 6, the carrier is made of a single synthetic resin made from the same mineral material, but at least the outer skin part of the carrier is made of an elastic material with high shape restoring force, and the other parts are made of a different material. It can also be constructed from materials. For example, although not particularly shown, the skin of a cube is made of an elastic body with excellent shape restoring force, the core is made of a synthetic resin made from a mineral material with a specific gravity different from that of the skin, and the average specific gravity of the carrier is made of sewage or It can also be adjusted to match the specific gravity of the solid content. In addition, by forming the core part with a carrier rich in enzymes and covering the epidermis with an elastic material with high shape restoring force, enzymes can be supplied to aerobic microorganisms over a long period of time. Furthermore, it is also possible to configure a part of the core portion to be exposed.

According to the present invention described above, the organic matter floating in the water to be treated is sterilized by micro-nano bubbles of ozone in the treatment tank 30 (accommodation tank), and the residual ozone bubbles floating in the water to be treated are further removed by oxygen molecules. It is possible to reduce residual ozone by chemically changing it to _O2 , and at the same time, by generating abundant hydroxyl radicals, it promotes the decomposition of suspended solids (SS) and soluble organic matter, and the activated carbon 58 of the carrier 51 as well as the oxygen molecules are promoted. Biological treatment can be activated by the oxygen bubbles adsorbed on. That is, the carrier 51 can be used as a reaction site for ozonolysis and biological treatment. Furthermore, by floating micro-nano bubbles containing α particles in the water to be treated, the α particles can act on the water to be treated over a wide range without being attenuated, thereby increasing the denitrification effect. Therefore, using a single treatment tank 30, it is possible to simultaneously achieve sterilization treatment using ozone, denitrification treatment using α particles, and biological treatment using aerobic microorganisms. In addition, due to the micro-nano bubble effect, the resistance of wastewater is reduced, and not only aerobic microorganisms but also facultative anaerobic microorganisms present inside the carrier 51 are activated by the penetration of micro-nano bubble water deoxidized by aerobic microorganisms. and promotes the decomposition of organic matter. Further, aerobic microorganisms nitrify using oxygen (O ₂ ), and resistance is further reduced by minute micro-nano bubbles, so that facultative anaerobic microorganisms denitrify the liquid that has penetrated deep into the carrier 51. That is, this effect also works effectively in nitrification and denitrification. This promotes the food chain (including cannibalism between microorganisms) within the carrier 51, making it possible to achieve early and high-level biological treatment without generating excess sludge. The facultative anaerobic microorganisms inside the carrier 51 have improved water permeability due to the micro-nano bubbles, so that the amount of oxygen-containing micro-nano bubbles at least comes into contact with water more frequently, and oxygen is adsorbed by the aerobic microorganisms on the surface layer. After that, the oxygen-poor liquid enters, and as a result, the activity of facultative anaerobic microorganisms becomes active, which enables rational nitrification and denitrification, making it possible to downsize and save energy in bubble generators. .

Next, a wastewater treatment apparatus according to a second embodiment will be described with reference to FIGS. 7 and 8. Note that the same configuration and overlapping configuration as in the previous embodiment will be omitted.

As shown in FIG. 7, the wastewater treatment device 11 of the second embodiment includes a reaction tank 10 for performing ozone treatment as a pretreatment tank, an ozone bubble generator 20, and an ozone treatment and denitrification treatment as a storage tank. It mainly includes a treatment tank 30 for performing biological treatment, and a bubble generator 40 for ozone, oxygen (air), and alpha rays. That is, the wastewater treatment device 11 of the second embodiment differs from the wastewater treatment device 1 of the first embodiment in that a reaction tank 10 and an ozone bubble generator 20 are added, and the other configurations are the same as the wastewater treatment device 1. be.

The reaction tank 10 is a substantially cylindrical water tank into which the water to be treated from the raw water tank 4 is introduced via a transfer pipe 7 connected to the raw water pump 5. A water suction pump 27, a transfer pump 15 for transferring to the next processing tank 30, and a float 16 as a water level sensor are installed. In this embodiment, the internal capacity of the reaction tank 10 is approximately 2.7 tons, that is, the processing tank 30 described above has an internal capacity approximately 20 times that of the reaction tank 10. Furthermore, an ozone generator 29 constituting the ozone bubble generator 20 is installed outside the reaction tank 10, and is connected to the micro-nano bubble generator nozzle 25 via a connecting pipe 26.

Next, as shown in FIG. 7, the ozone bubble generator 20 will be explained. The ozone bubble generator 20 is arranged at the bottom of the reaction tank 10 and mainly includes a water suction pump 27 that absorbs liquid, a micro-nano bubble generation nozzle 25, and an ozone generator 29 provided outside the reaction tank 10. has been done. This water suction pump 27 is adapted to absorb the liquid inside the reaction tank 10 from a water suction portion 27a at its lower part.

As shown in FIG. 8, the micro-nano bubble generation nozzle 25 is attached to the tip of a connecting pipe 28 extending from the water suction pump 27, and the liquid absorbed by the water suction pump 27 is supplied to the micro-nano bubble generation nozzle 25. It is designed to be blown out.

Ozone generated by an ozone generator 29 installed outside the reaction tank 10 and taken in through an intake pipe 26 connected to the ozone generator 29 passes through a plurality of branch pipes 24 into the compression section 22. It is supposed to be squirted. The air bubbles ejected from the branch pipe 24 into the compression section 22 become ultrafine bubbles and are mixed with the liquid within the compression section 22 . Then, these ultrafine bubbles are ejected from the blow-off section 23 into the reaction tank 10 as ozone micro-nano bubbles.

That is, the micro-nano bubble generation nozzle 25 is submerged below the surface of the liquid in the reaction tank 10, and blows out a liquid containing ozone micro-nano bubbles into the water.

Next, the procedure for treating wastewater by the treatment device 11 of the second embodiment will be explained using FIGS. 7 and 8. First, when more than a certain amount of wastewater (water to be treated) discharged from the factory 2 is stored in the raw water tank 4, the float 6 detects a predetermined water level, and the raw water pump 5 is activated. The water to be treated in 4 is transferred to reaction tank 10. That is, the water to be treated in the raw water tank 4 is intermittently transferred to the reaction tank 10.

In the reaction tank 10, an ozone supply step, that is, an ozone treatment using micro-nano bubbled ozone is performed. In detail, ozone (O ₃ ), which has a strong oxidizing power, is bubbled into micro-nano-level bubbles, which generates a large amount of OH groups (OH-) and removes organic matter contained in the water to be treated. Physically decompose. In this way, since organic matter is physically decomposed by ozone (O ₃ ), it becomes easier for microorganisms to prey on it in the treatment tank 30.

Next, when a certain amount of water or more is stored in the reaction tank 10, the float 16 provided in the reaction tank 10 detects a predetermined water level, and the transfer pump 15 is activated, and as described above, the float 16 installed in the reaction tank 10 detects a predetermined water level. The ozone-treated water to be treated is transferred to the treatment tank 30 via the transfer pipe 17. That is, the water to be treated in the reaction tank 10 is intermittently transferred to the treatment tank 30. Note that most of the ozone (O ₃ ) in the reaction tank 10 is chemically changed into oxygen (O ₂ ) due to the oxidation effect described above, but the rest still remains as ozone micro-nano bubbles. This residual ozone is transferred to the treatment tank 30 together with the water to be treated. In the treatment tank 30, as in the first embodiment described above, the air containing oxygen and α particles, which is taken in from the atmosphere into the micro-nano bubble generation nozzle 45 through the introduction pipe 61, passes through the plurality of branch pipes 24. It is designed to be ejected into the compression section 22.

In this embodiment, ozone treatment is carried out in the reaction tank 10 as a pre-treatment tank, but the present invention is not limited to this. For example, an appropriate agent such as a flocculant can be added to flocculate organic matter in the water to be treated. - Pretreatment such as precipitation may be performed.

In addition, residual ozone bubbles contained in the water to be treated transferred from the reaction tank 10 to the treatment tank 30 are added to the circulation flow in the treatment tank 30 along with bubbles containing the water to be treated, oxygen, and α particles in the treatment tank 30. Drifting inside. Here, the carrier 51, which also drifts with the water to be treated, serves as a place to collect the remaining ozone bubbles and oxygen (air) bubbles.In other words, the remaining ozone bubbles come into contact with the pores 52 of the carrier 51, and the ozone molecules are separated from each other. A chemical change that results in oxygen molecules is promoted.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions that do not depart from the gist of the present invention are included in the present invention. It can be done.

For example, in the second embodiment, the water to be treated is transferred and treated in the order of raw water tank 4, reaction tank 10, and treatment tank 30, but for example, between raw water tank 4 and reaction tank 10, or between reaction tank A separate device may be added, such as interposing a solid-liquid separator between the processing tank 10 and the processing tank 30.

1 Wastewater treatment device 2 Factory 4 Raw water tank 5 Raw water pump 7 Transfer pipe 10 Reaction tank 15 Transfer pump 17 Transfer pipe 17a Inlet 20 Ozone bubble generator (ozone generator)
25 Micro-nano bubble generation nozzle 27 Water suction pump 29 Ozone generator 30 Processing tank (accommodation tank)
30c Bubble discharge port 30d Discharge port 39 Drain pipe 40 Bubble generator (supply means)
45 Micronano bubble generation nozzle 47 Water suction pump 49 Ozone generator 50 Bacteria bed 51 Carrier 52 Holes 58 Activated carbon (porous material)
58a Porous 61 Introductory pipe 62 On-off valve 65 Net member (α-ray source part)
65a Mesh 66 Coating agent (α-ray source part, α-particle release agent)
66a α particle

Claims (9)

A wastewater treatment device comprising at least a storage tank that accommodates water to be treated, and a supply means for supplying micro-nano bubbles containing ozone, oxygen, and α particles into the storage tank. . A claim characterized in that the supply means includes an introduction pipe having an opening for introducing air, an ozone generator communicating with the introduction pipe, and an α-ray source supplying α particles to the air. 1. The wastewater treatment device according to 1. The wastewater treatment apparatus according to claim 2, wherein the α-ray source section is provided inside the introduction pipe. 4. The wastewater treatment apparatus according to claim 3, wherein the α-ray source section comprises a net-like member in which a large number of meshes are formed, and an α-particle releasing agent that coats the outer surface of the net-like member. 5. The wastewater treatment apparatus according to claim 1, wherein the supply means includes a nozzle that generates the micro-nano bubbles using cavitation. 6. The wastewater treatment apparatus according to claim 1, wherein the storage tank contains a porous material containing at least aerobic microorganisms, containing carbon as a component, and having micro-nano level porosity. A wastewater treatment method, comprising at least a bubble supply step of supplying micro-nano bubbles containing ozone, oxygen and α particles to a storage tank containing water to be treated. 8. The wastewater treatment method according to claim 7, wherein in the bubble supply step, micro-nano bubbles are generated in a mixture of the ozone and the air to which the α particles have been added. Claim 7 or 8 characterized by comprising the bubble supplying step and a biological treatment step of carrying out biological treatment using a porous material that includes at least aerobic microorganisms, contains carbon as a component, and has micro-nano level porosity. The wastewater treatment method described in .

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